Ticket #48152 - [adminutil] support NSS 3.18
    
    Description: adding new NSS error codes / messages to
    include/libadmsslutil/{SECerrs.h,SSLerrs.h}.
    
    https://fedorahosted.org/389/ticket/48152
    
    Reviewed by rmeggins@redhat.com (Thank you, Rich!!)